Bernhard Müller was Manager of Research and Development for Mueller Solartechnik in Offenheim, Germany. He is the inventor of the Pil Kaar, Kundu Kaar, Zèbre and Mata Hari solar cookers and modified the Primrose of Roger Bernard. Bernhard is a founding member of the Solar Cookers World Network, a member of American Society of Agricultural and Biological Engineers (ASABE), and supporting member of EG-Solar e.V.
The solar cooker production ended in 2012 (retirement). As per November 2012 Bernhard Müller limits his activities to consulting, independent solar cookers tests and publication of information on solar cooking.

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Recent news and developments

TFC (Twin Fresnel Cooker

December 2012: Bernie Müller has published findings based on his experimentation with a twin Fresnel lens reflector solar cooker. This cooker was never meant to be a production prototype, and his company, Mueller Solartechnik, no longer manufactures solar cookers. As an engineering exercise, he has shown that incorporating the Fresnel lens produces quite high temperatures(278.6°C/534°F). However, the usable cooking area is small.